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use fbo::{Fbo, BorrowColorAttach, BorrowDepthAttach};
use ::Rect;
use std::rc::Rc;

pub trait OffscreenBuffer {
    type ColorAttach: BorrowColorAttach;
    type DepthAttach: BorrowDepthAttach;
    fn render_buffer(&self) -> &Fbo<Self::ColorAttach, Self::DepthAttach>;
    fn color_attachment(&self, idx: usize) -> Option<&Self::ColorAttach>;
    fn depth_attachment(&self) -> Option<&Self::DepthAttach>;
}

impl<'a, C: BorrowColorAttach, D: BorrowDepthAttach> OffscreenBuffer for Fbo<C,D>{
    type ColorAttach = C;
    type DepthAttach = D;
    fn render_buffer(&self) -> &Fbo<C,D>{
        self
    }

    fn color_attachment(&self, idx: usize) -> Option<&C>{
        self.color(idx)
    }

    fn depth_attachment(&self) -> Option<&Self::DepthAttach>{
        self.depth()
    }
}

impl<'a, C: BorrowColorAttach, D: BorrowDepthAttach> OffscreenBuffer for &'a Fbo<C,D>{
    type ColorAttach = C;
    type DepthAttach = D;
    fn render_buffer(&self) -> &Fbo<C,D>{
        self
    }

    fn color_attachment(&self, idx: usize) -> Option<&C>{
        self.color(idx)
    }

    fn depth_attachment(&self) -> Option<&Self::DepthAttach>{
        self.depth()
    }
}

impl<C: BorrowColorAttach, D: BorrowDepthAttach> OffscreenBuffer for Rc<Fbo<C,D>>{
    type ColorAttach = C;
    type DepthAttach = D;
    fn render_buffer(&self) -> &Fbo<C,D>{
        &self
    }

    fn color_attachment(&self, idx: usize) -> Option<&C>{
        self.color(idx)
    }

    fn depth_attachment(&self) -> Option<&Self::DepthAttach>{
        self.depth()
    }
}

pub unsafe trait UntypedOffscreenBuffer {
    fn id(&self) -> u32;
    fn viewport(&self) -> Rect;
    fn bind_attachments(&self);
}

unsafe impl<F: OffscreenBuffer> UntypedOffscreenBuffer for F{
    fn id(&self) -> u32{
        self.render_buffer().id()
    }

    fn viewport(&self) -> Rect{
        self.render_buffer().viewport()
    }

    fn bind_attachments(&self) {
        self.render_buffer().bind_attachments()
    }
}